The webapp provides for each item the link on ECB's website.
Speeches for : Yves Mersch where "improved" appeared
2017-04-08 : Remarks on the future of economic governance in Europe and the euro2014-01-13 : “Europe after the warm reboot”
2013-11-15 : The overhaul of the architecture of the euro area and the return of investor confidence
2013-06-17 : The European Central Bank's role in overcoming the Crisis